Effectiveness of a Plastic Design Approach for CFT Columns in Frame Structures Subjected to Lateral Forces

SeongHun Kim; Hyo-Gyoung Kwak

doi:10.7734/COSEIK.2024.37.6.391

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2024 Vol.37, Issue 6 Preview Page Next Page

Research Paper

Effectiveness of a Plastic Design Approach for CFT Columns in Frame Structures Subjected to Lateral Forces 수평 하중을 받는 프레임 구조물에서 CFT 기둥의 소성 설계 접근법의 효율성 분석

31 December 2024. pp. 391-400

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Abstract

In this study, when designing a frame structure based on plastic design, the differences in structure manufacturing cost and behavior according to the type of column are investigated. It is important to select an appropriate column member for a structure that is subjected to both axial and lateral loads. If the plastic design method is adopted for the efficient design of the structure, the role of the column becomes more emphasized because not only the beam but also the column plays the role of transferring the surplus moment to other members when the beam is subjected to an overload. In particular, the lateral load requires the ductility of the column, and the Concrete filled tube (CFT)-type column member secures the ductility through a higher steel ratio than the Reinforced Concrete (RC) member. Therefore, if the structure is designed by applying plastic design to the structure to which the lateral load is applied, the CFT column member will show better performance than the RC column member. To confirm that the CFT member has better performance than the RC, in this study, the columns are designed and analyzed differently for a symmetric structure with a low floor, an asymmetric structure with a low floor, and a symmetric structure with a high floor. The advantages of adopting CFT column members on frame plastic design will be shown through the differences in the load type and cost of the columns according to the various structure types.

Keywords

plastic analysis

CFT

structural analysis

plastic hinge

column design

본 논문에서는 소성 설계를 기반으로 한 프레임 구조 설계 시, 기둥의 종류에 따른 구조 제작 비용과 거동의 차이를 연구하였다. 축력과 횡력을 모두 받는 구조물에 적합한 기둥 부재를 선택하는 것이 중요하며, 플라스틱 설계 방법을 채택할 경우 기둥의 역할이 더욱 강조된다다. 특히, 횡력은 기둥의 연성을 요구하며, CFT(콘크리트 충전 강관)형 기둥은 RC(철근 콘크리트) 기둥보다 높은 강철 비율로 연성을 확보하게 된다. 이 논문에서는 CFT 기둥이 RC 기둥보다 더 나은 성능을 보이는지 확인하기 위해 다양한 구조 유형에서 기둥을 설계하고 분석하였다. CFT 기둥을 소성 설계에 채택함으로써 얻을 수 있는 이점은 다양한 구조 유형에 따른 하중 유형의 분석을 통해 제시한다.

키워드

소성해석

CFT

구조 해석

소성 힌지

기둥 설계

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 37
No :6
Pages :391-400
Received Date : 2024-08-28
Revised Date : 2024-09-25
Accepted Date : 2024-09-26
DOI :https://doi.org/10.7734/COSEIK.2024.37.6.391

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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